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| author | Sasha Levin <sasha.levin@oracle.com> | 2014-01-24 00:52:54 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-24 01:36:50 +0100 |
| commit | 309381feaee564281c3d9e90fbca8963bb7428ad (patch) | |
| tree | 7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /mm/page_io.c | |
| parent | fs/proc/page.c: add PageAnon check to surely detect thp (diff) | |
| download | linux-309381feaee564281c3d9e90fbca8963bb7428ad.tar.xz linux-309381feaee564281c3d9e90fbca8963bb7428ad.zip | |
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
Most of the VM_BUG_ON assertions are performed on a page. Usually, when
one of these assertions fails we'll get a BUG_ON with a call stack and
the registers.
I've recently noticed based on the requests to add a small piece of code
that dumps the page to various VM_BUG_ON sites that the page dump is
quite useful to people debugging issues in mm.
This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what
VM_BUG_ON() does, also dumps the page before executing the actual
BUG_ON.
[akpm@linux-foundation.org: fix up includes]
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_io.c')
| -rw-r--r-- | mm/page_io.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index 8c79a4764be0..7247be6114ac 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -320,8 +320,8 @@ int swap_readpage(struct page *page) int ret = 0; struct swap_info_struct *sis = page_swap_info(page); - VM_BUG_ON(!PageLocked(page)); - VM_BUG_ON(PageUptodate(page)); + VM_BUG_ON_PAGE(!PageLocked(page), page); + VM_BUG_ON_PAGE(PageUptodate(page), page); if (frontswap_load(page) == 0) { SetPageUptodate(page); unlock_page(page); |